# McDermitt Caldera

- **Country:** United States
- **Coordinates:** 41.850278, -118.036667
- **Age:** 19 million years (Miocene)
- **Type:** Caldera
- **Highest:** Jordan Meadow Mountain
- **Location:** Harney County, Oregon Malheur County, Oregon Humboldt County, Nevada
- **Width Mi:** 22
- **Length Mi:** 28
- **Elevation Ft:** 6816
- **Last Eruption:** 16.39 ± 0.02 million years ago (Miocene)
- **Label Position:** top
- **Width Orientation:** east–west
- **Length Orientation:** north–south

The Thacker Pass lithium deposit, located within the caldera, is a prospect that in 2017 was said to be the most significant lithium-clay resource in the U.S. Additional lithium exploration was approved in the northern end of the caldera in 2025.

![Photo of McDermitt Caldera](https://upload.wikimedia.org/wikipedia/commons/f/f3/USGS_McDermitt_caldera_geologic_cross-section.png)

**Source:** https://en.wikipedia.org/wiki/McDermitt_Caldera (Wikipedia, CC BY-SA)